Comparison

EF Scale vs Solar Activity Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

EF Scale

Assess tornado and wind damage with this tool that simplifies the Enhanced Fujita (EF) Scale. Follow on-screen prompts to select damage indicators and degrees of damage, then adjust for construction variability to estimate wind speeds.

Highlights
  • Simplified EF Scale assessment
  • Damage indicator selection
  • Degree of damage input
  • Construction variability adjustment
  • Visual damage examples
  • About and share functions
Features
Read full description

Rate tornado damage the way surveyors do. EF Scale puts the complete Enhanced Fujita scale on your iPhone, iPad, and Mac — all 28 damage indicators, every degree of damage, and the expected wind speeds behind each rating. Browse structure types from small barns and family residences to high-rise buildings, transmission lines, and trees. Compare what you see against reference photos and construction details, then pick a degree of damage and tune the wind speed estimate between its bounds to account for construction quality. • All 28 damage indicators of the Enhanced Fujita scale • Reference photos and construction details for every indicator • Degrees of damage with expected wind speeds and EF ratings • Interactive wind speed estimator with adjustable bounds • EF0–EF5 rating reference, always a tap away • Everything stored on device — works fully offline in the field Built for storm spotters, damage surveyors, emergency managers, students, and weather enthusiasts. *** PLEASE REMEMBER: This app is for reference purposes only. Doing a real damage survey takes knowledge and experience you can't build into an app! Official damage assessments are the business of the National Weather Service and their delegates! ***

About

Solar Activity Pro

Monitor solar activity and its potential effects on well-being and technology. Get aurora forecasts, real-time data, and customizable widgets. Stay informed about space weather events with detailed indicators and notifications.

Highlights
  • Widgets for solar activity
  • Push notifications
  • Aurora forecast and cameras
  • KP and AP index tracking
  • Solar wind and electron/proton flux data
  • Sunspot and electron content maps
Read full description

Solar Activity Pro — your space weather companion Geomagnetic and solar activity can affect how you feel — from headaches and fatigue to general malaise — and can also influence technical systems such as GPS, satellites, and radio communications. Solar Activity Pro helps you stay informed about what is happening on the Sun and around Earth, whether you are an aurora hunter, a space weather enthusiast, or simply curious about solar storms. NEW: Aurora Map Explore Northern Lights probability on an interactive world map powered by NOAA OVATION data. Tap anywhere to see aurora probability, coordinates, and place name. Customize the map with multiple styles, cloud overlay, aurora intensity, and your current location. Stay informed - Push notifications for NOAA space weather alerts - Alerts screen with solar activity warnings and impacts timeline - Live dashboard with key gauges (solar wind speed, density, Bz, Bt, Kp, Dst, magnetometer, electron flux) - Boulder Kp index with trend direction Forecasts - Kp and Ap index forecasts - Predicted solar wind - 24-hour and weekly outlooks - Solar activity reports - Sunspot number and F10.7 radio flux forecasts Observations (last 24 hours) - Solar wind speed, density, and temperature - Magnetometer data - Electron and proton flux Aurora - Interactive Aurora Map (NOAA OVATION) - Northern and Southern Lights models - Tonight and tomorrow aurora outlook - Live aurora cameras - aurora forecast for major cities around the world - you can select your city on the map to get an aurora forecast - aurora forecast powered by artificial intelligence Models & maps - Solar wind velocity, density, and pressure animations - Global and regional ionospheric perturbation maps - Total Electron Content (TEC) — global and North America - CTIPe, WAM-IPE, and GloTEC models Media - Aurora cameras from observation stations - Latest solar images (including DSCOVR) - Space weather videos Knowledge base - Phenomena — 16 illustrated topics: aurora, coronal holes, CMEs, geomagnetic storms, solar wind, flares, sunspots, ionosphere, radiation belts, cosmic rays, and more - Impacts — how space weather affects GPS, HF radio, satellites, power grids, and satellite drag Widgets Add live data to your Home Screen: - Planetary Kp index - Space weather conditions - DSCOVR solar view - Latest X-ray flare event - Observations - Aurora cameras - Solar images Access to the application is carried out through a subscription system. You can choose a subscription for one month or one year. Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase App used standard EULA agreement - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ App privacy policy - https://drive.google.com/file/d/1ksHp-nv_gkoOiqq6i8wENw9LJw-ey8NH/view?usp=sharing

Screenshots

EF Scale4 screens
Solar Activity Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: EF Scale at none against Solar Activity Pro's 3. EF Scale also leads on rating (4.5 vs 4.2) and review sentiment (67% vs 50%). Solar Activity Pro's advantage is update cadence (fortnightly vs every 20 months) and iOS requirement (17 vs 26.0). On price, ratings volume, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Solar Activity Pro sells 3 in-app purchases, starting at $2.99 per month. EF Scale asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

EF Scale holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 4 and 5 respectively. Written reviews point the same way: 67% of EF Scale's written reviews are positive against 50% of Solar Activity Pro's.

UpkeepUpdate frequency

EF Scale ships an update every 20 months, Solar Activity Pro fortnightly. The most recent releases landed on August 8, 2026 and September 25, 2026 respectively.

Scorecard6 real differences · 4 level
EF Scale versus Solar Activity Pro: the parameters behind the verdict, then further details
ParameterEF ScaleSolar Activity Pro
PriceFreeFree
Rating4.5 (4 ratings) — better4.2 (5 ratings)
Positive reviews66.7% of reviews — better50.0% of reviews
Number of ratings45 — better
Update frequencyEvery 20 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, MaciPhone, iPad, Mac
Requires iOS26.017 — better
Further details — not scored
Size18 MB40 MB
Age rating4+4+
DeveloperWeatherWary LLCPavel Koyushev

Customer experience

EF Scale

All ratings4 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews9 reviews
Positive66.7%
Neutral22.2%
Negative11.1%

Solar Activity Pro

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

EF Scale

No in-app purchases

3 purchases

Solar Activity Pro

Subscriptions3
  • Monthly subscription$2.991 Month
  • 3 Months subscription$6.993 Months
  • Yearly subscription$17.991 Year

Questions

Is EF Scale free?
EF Scale is free to download, with no in-app purchases.
Is Solar Activity Pro free?
Solar Activity Pro is free to download, with in-app purchases available.
Which has better reviews, EF Scale or Solar Activity Pro?
EF Scale is rated higher. EF Scale averages 4.5 out of 5 from 4 ratings, while Solar Activity Pro averages 4.2 from 5 ratings.
Do EF Scale or Solar Activity Pro have ads?
Neither EF Scale nor Solar Activity Pro shows ads.
Which is updated more often, EF Scale or Solar Activity Pro?
EF Scale ships an update every 20 months, and Solar Activity Pro fortnightly. Most recently, EF Scale was updated on August 8, 2026 and Solar Activity Pro on September 25, 2026.

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